nuget: bump Avalonia from 0.10.15 to 0.10.18 (#3817)
Bumps [Avalonia](https://github.com/AvaloniaUI/Avalonia) from 0.10.15 to 0.10.18.
- [Release notes](https://github.com/AvaloniaUI/Avalonia/releases)
- [Commits](https://github.com/AvaloniaUI/Avalonia/compare/0.10.15...0.10.18)
---
updated-dependencies:
- dependency-name: Avalonia
dependency-type: direct:production
update-type: version-update:semver-patch
...
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dependabot[bot]